Inorganic Fiber Damage Evolution during Textile Processing

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GE Aviation Bromont (GEAB) is currently developing ceramic matrix composites (CMCs) for engine**applications. These CMCs are made with silicon carbide (SiC) ceramic fiber embedded in a SiC matrix**material. The SiC ceramic fibers forming the yarns are highly stiff and brittle. During all yarn handling**operations (e.g., coating, spooling, etc.), yarns undergo a moderate level of damage. This damage accumulates**and has a detrimental effect on both part quality and yield. A recent collaboration between GEAB and**Polytechnique Montreal has resulted in the development of a modelling and testing approach to understand the**fiber damage mechanisms during yarn processing. As a continuation of this project, this present Engage Plus**proposal's objective is to develop and validate a modelling approach to understand the fiber damage evolution**during yarn processing. A parametric non-linear finite element model has been created in Abacus to represent**yarn handling situations. This model will now be used to compare different parameters' influence on friction**dissipated energy and damage. A small test rig using a moving yarn torture device running against a yarn fixed**between to load cells has been built. This rig will now be used to reproduce different damage creation**conditions. Test conditions will include yarn moving speed against the pulleys, rotation speed of the pulleys,**diameter and shape of the pulleys, and pulley material. With this project, we will develop validated modelling**approaches to understand fiber-fiber and fiber-surface friction interactions. GE Aviation Bromont will expand**its R&D efforts towards high performance composite applications in aircraft engines.